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L'n'vr KEILER; 0F' onrnwissi, PENNSYLVANM.' Letters .Patent-No. 73,449, dated January 21, 1868; anteclatecl January 6,1868.

IMPROVEMNT IN GALGULATING-MAGHINES.

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'.'lO ALL WHOM IT vMAY CONCERN:

Be it known that LLEVI KI'LER, of Catatvissa, Columbia county, Stato of Pennsylvania, have invented an Improved Calculating-Machine; and I do hereby declare the following to be an exact description thereof,

, referene being had to theaccompanying drawings, and to the letters of reference marked thereon, making a.

part of this specification, in which- Figure l is a side elevation of 'the calculating-machine. i 'Figure 2 an end view. v Figure 3 a. top view.

The nature of mynvention consistsof two wheels or disks, the larger `beingnumbered near t or centre projecting on the but loosely, allowing it to turn in it; and lastly, a. washer or nut is put on the projecting centre'ot` the smaller disk and on the back of the larger, to secure the latter in its`place, but not in sin close Contact with it as to prevent the flee turning ofthe smaller disk. A wire bar runs through the lower edge of the larger disk, to hold it in a vertical position while the other disk turns.

A represents the frame that supports the machine; B, the screw-shaft, on whieh the disks C and D hang and operate; E, the Wire'bar, that holds the larger disk, C; G is'the nut that is attached to the centre of the smaller disk D, but operates behind the larger disk C; H are five small projecting pins, by which the smaller disk D is revolved.

To operate the machine, turnv the disks C and D to O on the Soren-shaft B, with No. l, on revolving disk D, at O on tho disk C. Then, suppose you wish to add the sums 15, 18, 20, 30, and 45, turn 15 to O, then turn 15 to 18, and33-will beatO; turn b3 to 20; and53'will be theregturnthat to 80, and 83 will be seen, to 45, will show 1 on the shaft B and 28 at O, and 28 at O on the disk D, and so on.

There is no slip or lost motion about this machine by which it can gain or lose. The disks may be made of any material, metal, wood, or pasteboard. The machine can be used perpndienlarly as well as horizontally.

I do not claim the numbering of two disks in opposite directionsfas thatlias been done betere; but

What I claim as my; invention, and desire to seeurehy Letters Patent, s

The two disks, C and D, graduated screw-shaft B,`and as herein described and for the purposes set forth.

which, turned guide-barE, when arranged, combined, and operated LEVI KEILER. v Witnesses:

M. M. Baonsr, JOHN JAMESON. 

